Update vrchat-world-ci-macos.yml

Author: BenjiThatFoxGuy

.github/workflows/vrchat-world-ci-macos.yml

@@ -20,7 +20,7 @@ concurrency:
 
 jobs:
   build-and-upload-nightly-world-macos:
-    runs-on: [self-hosted, macOS]
+    runs-on: [self-hosted, mac]
     timeout-minutes: 30
     env:
       workspace-path: "${{ github.workspace }}"